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<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Dear Philip,
Crispin,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Actually what I
read online about ultrafine particles (on a few French articles) is that the
fact they are small make them more likely to penetrate the body, be retained by
the tissues, and go into the blood. And paradoxically, they are potentially
more toxic than bigger particles, precisely because they are small. The active
substances are at their surface, so it is the surface, not the mass, that
counts in the toxicity.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>I read also
that their effect on health is not well-known, but potentially toxic.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><a
href="https://en.wikipedia.org/wiki/Ultrafine_particle">https://en.wikipedia.org/wiki/Ultrafine_particle</a>
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>So again, more
science on the question is necessary, but I would understand if measures are
taken now to prevent emissions of ultrafine particles, as well as exposure.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Best,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Xavier<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-family:"Tahoma","sans-serif"'>De :</span></b><span
style='font-family:"Tahoma","sans-serif"'> Stoves
[mailto:stoves-bounces@lists.bioenergylists.org] <b>De la part de</b>
plloyd@mweb.co.za<br>
<b>Envoyé :</b> mercredi 9 mai 2018 20:00<br>
<b>À :</b> Discussion of biomass cooking stoves<br>
<b>Objet :</b> [Stoves] ***SPAM*** Re: ***SPAM*** RE: Stoves Digest, Vol
93, Issue 5<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Confirm.
Around 0.4 microns, retention in the lungs is very low, not really measurable.
Philip</span><br>
<br>
Sent from my Huawei Mobile<o:p></o:p></p>
<div>
<p class=MsoNormal><br>
<br>
-------- Original Message --------<br>
Subject: [Stoves] ***SPAM*** RE: Stoves Digest, Vol 93, Issue 5<br>
From: Crispin Pemberton-Pigott <br>
To: Discussion of biomass cooking stoves <br>
CC: <br>
<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'>Dear Norbert<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'>I defer to Profs
Harold Annegarn and Philip Lloyd on this matter of inhalation, but I understand
from them that below a certain aerodynamic diameter, particles are too small to
be impacted and stick in the lungs, and only enter the body by diffusion, like
gases. Small particles are inhaled and exhaled again. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'>Regards<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'>Crispin</span><span
lang=EN-CA style='font-size:11.0pt'> <o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-CA style='font-size:11.0pt'><o:p> </o:p></span></p>
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